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Names | |||
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IUPAC name
(O-2H1)Water | |||
Other names
Deuterium hydrogen monoxide | |||
Identifiers | |||
3D model (JSmol) |
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ChEBI | |||
ChemSpider | |||
115 | |||
PubChem CID |
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CompTox Dashboard (EPA) |
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Properties | |||
H2HO (also HDO) | |||
Molar mass | 19.0214 g mol−1 | ||
Appearance | Very pale blue, transparent liquid, very similar to regular water | ||
Density | 1.054 g cm−3 | ||
Melting point | 3.81 °C (38.86 °F; 276.96 K) | ||
Boiling point | 100.74 °C (213.33 °F; 373.89 K) | ||
miscible | |||
log P | −0.65 | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). |
Semiheavy water is the result of replacing one of the protiuminlight water with deuterium.[1] It exists whenever there is water with light hydrogen (protium, 1H) and deuterium (D or 2H) in the mix. This is because hydrogen atoms (hydrogen-1 and deuterium) are rapidly exchanged between water molecules. Water containing 50% H and 50% D in its hydrogen contains about 50% HDO and 25% each of H2O and D2O, in dynamic equilibrium.[2] In regular water, about 1 molecule in 3,200 is HDO (one hydrogen in 6,400 is D). By comparison, heavy waterD2O[3] occurs at a proportion of about 1 molecule in 41 million (i.e., one in 6,4002). This makes semiheavy water far more common than "normal" heavy water.
The freezing point of semiheavy water is close to the freezing point of heavy water at 3.8°C compared to the 3.82°C of heavy water.
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Alkali metal (Group 1) hydrides |
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Alkaline (Group 2) earth hydrides |
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Group 13 hydrides |
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Group 14 hydrides |
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Pnictogen (Group 15) hydrides |
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Hydrogen chalcogenides (Group 16 hydrides) |
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Hydrogen halides (Group 17 hydrides) |
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Transition metal hydrides |
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Lanthanide hydrides |
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Actinide hydrides |
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Exotic matter hydrides |
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